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We report on a study of the invariant mass spectrum of the hadronic system inthe decay tau- -> pi- pi0 nu_tau. This study was performed with data obtainedwith the CLEO II detector operating at the CESR e+ e- collider. We present fitsto phenomenological models in which resonance parameters associated with therho(770) and rho(1450) mesons are determined. The pi- pi0 spectral functioninferred from the invariant mass spectrum is compared with data on e+ e- -> pi+pi- as a test of the Conserved Vector Current theorem. We also discuss theimplications of our data with regard to estimates of the hadronic contributionto the muon anomalous magnetic moment.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Hadronic structure in the decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>τ</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:…

Hadronic structure in the decayτ−→π−π0